"""Couche d'accès SQLite (aiosqlite) — unique source de vérité de l'application."""

import aiosqlite

from app.config import get_settings

SCHEMA = """
CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT NOT NULL UNIQUE COLLATE NOCASE,
    password_hash TEXT NOT NULL,
    is_admin INTEGER NOT NULL DEFAULT 0,
    is_active INTEGER NOT NULL DEFAULT 1,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS refresh_tokens (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token_hash TEXT NOT NULL UNIQUE,
    expires_at TEXT NOT NULL,
    revoked INTEGER NOT NULL DEFAULT 0,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS downloads (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    source_key TEXT NOT NULL,          -- clé de déduplication (video_url normalisée)
    video_url TEXT NOT NULL,
    page_url TEXT,
    title TEXT NOT NULL,
    file_path TEXT,                    -- relatif au dossier de téléchargement
    status TEXT NOT NULL DEFAULT 'pending'
        CHECK (status IN ('pending','downloading','paused','done','failed','cancelled')),
    total_bytes INTEGER,
    downloaded_bytes INTEGER NOT NULL DEFAULT 0,
    error TEXT,
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);
CREATE INDEX IF NOT EXISTS idx_downloads_status ON downloads(status);
CREATE UNIQUE INDEX IF NOT EXISTS idx_downloads_active_source
    ON downloads(source_key) WHERE status IN ('pending','downloading','paused');

CREATE TABLE IF NOT EXISTS metadata_cache (
    cache_key TEXT PRIMARY KEY,
    payload TEXT NOT NULL,             -- JSON
    fetched_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS settings (
    key TEXT PRIMARY KEY,
    value TEXT NOT NULL                -- JSON
);

CREATE TABLE IF NOT EXISTS favorites (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    source TEXT NOT NULL,
    source_id TEXT NOT NULL,
    title TEXT NOT NULL,
    image_url TEXT,
    payload TEXT,                      -- JSON métadonnées
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    UNIQUE (user_id, source, source_id)
);

CREATE TABLE IF NOT EXISTS watch_progress (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    download_id INTEGER NOT NULL REFERENCES downloads(id) ON DELETE CASCADE,
    position_seconds REAL NOT NULL DEFAULT 0,
    updated_at TEXT NOT NULL DEFAULT (datetime('now')),
    UNIQUE (user_id, download_id)
);
"""


class Database:
    """Connexion SQLite partagée, initialisée au démarrage de l'app."""

    def __init__(self) -> None:
        self._conn: aiosqlite.Connection | None = None

    async def connect(self) -> None:
        path = get_settings().database_path
        self._conn = await aiosqlite.connect(path)
        self._conn.row_factory = aiosqlite.Row
        await self._conn.execute("PRAGMA journal_mode=WAL")
        await self._conn.execute("PRAGMA foreign_keys=ON")
        await self._conn.executescript(SCHEMA)
        await self._conn.commit()

    async def close(self) -> None:
        if self._conn is not None:
            await self._conn.close()
            self._conn = None

    @property
    def conn(self) -> aiosqlite.Connection:
        if self._conn is None:
            raise RuntimeError("Database.connect() n'a pas été appelé")
        return self._conn

    async def execute(self, sql: str, params: tuple = ()) -> aiosqlite.Cursor:
        cursor = await self.conn.execute(sql, params)
        await self.conn.commit()
        return cursor

    async def fetchone(self, sql: str, params: tuple = ()) -> aiosqlite.Row | None:
        cursor = await self.conn.execute(sql, params)
        row = await cursor.fetchone()
        await cursor.close()
        return row

    async def fetchall(self, sql: str, params: tuple = ()) -> list[aiosqlite.Row]:
        cursor = await self.conn.execute(sql, params)
        rows = await cursor.fetchall()
        await cursor.close()
        return rows


db = Database()